Dredger pump



Nov. 27, 1928.

H. F. SCHMIDT DREDGER PUMP Filed Dec. 6, 1922 Maya/livid! INVENTORWlTNESSES:

ATTORNEY Patented Nov. 27, 1928 UNITED STATES PATENT OFFICE.

HENRY I. SCHMIDT, OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNOB TO WESTING- VANIA.

DBEDGEB PUMP.

Application filed December 6, 1922. Serial No. 605,314.

My invention relates to a pump of the propeller-typeparticularly adaptedfor use in dredging and in similar operations, and it has for its objectto provide apparatus of the character desi ated, which shall be simple,rugged and e cient in construction and operation; which shall beeffective to crush or to reduce by attrition large rocks or otherforeign bodies attempting to pass therethrough; and inWhichallparts-subject to wear or breakage may be readily replaced.

In the accompanying drawing, Figure 1 is a side view, partially insection and partially in elevation, of a ump constructed in accordancewith my lnvention; Figure 2 is a sectional View taken on the plane II-lIof Figure 1; and Figure 3 is a similar view taken on the plane III-IIIof Figure 1.

In the dredging field and insimilar applications, it has long. beendesirable to employ a propeller-type pump on account of its simplicity,compactness and high capacity, to-

plication has been dismissed because of the liability of the propellerto jamming and breakage because of the impact of boulders and otherforeign substances thereagainst.

In accordance with the present invention, I provide a propeller pumpwith a casing having internal teeth adapted to coact with the pumpblades in order to crush or to reduce by attrition large bouldersattempting to pass through the device and I, furthermore, employ suchclearances that the crushed or reduced particles shall not clogsubsequent to passing through the propeller.

Referring to the -drawing for a more detailed understanding of myinvention, I show an inlet casing at 5,- preferably curved in generalcontourso as to permit the introduction of a suitable propeller shaft 6thereinto through a suitable elongated boss 7.

The, casing 5 terminates in a plane flanged opening at 8 and the shaft 6carries a propeller member 9 arranged to rotate within the member 5 atsome distance back from the plane of the opening 8, the bladespreferably having a blunt intake edge and a sharp discharge edge asshown at 9'.

The member 5 is suitably recessed back from the opening 8 for thereception of a lining member 10 carrying inwardly projecting teeth 11-11positioned somewhat back of the propeller 9, this lining memberpreferably being formed in a plurality of segments 10' for facility incasting.

A divergent discharge member 12 is adapting 8 and carries gulde vanes13-13 adapted to prevent eddying in the discharge stream as fullydiscussed in my co-pending application, Serial No. 371,648, filed Apr.6', 1920, and assigned to the Westinghouse Electric & ManufacturingCompany. The vanes 13-13 are carrie between a lining member 14 seatedwithin the member 12 and a centrally-disposed guide cone 15 whichfurther acts to cause smooth, unbroken flow of the discharge stream.Preferably the lining member 14 is formed in a plurality of segments14', each carrying its blade 13, for facility in manufacture. The cone15 is provlded with a bearing at 16 to carry the outer end of the shaft6 so as to more firmly sup port the propeller 9. gether with goodefliciency, but such an ap- The member 10 with the teeth 11-11, themember 14 with the vanes 13-13, and the'propeller itself areprefe'rablyformed of material hlghly resistant to wear and breakage,such as chilled manganese, chromium or tungsten steel, and theconfiguration should be as simple as possible in order. to permit readycasting and chilling. By forming all parts in small portions orsegments, manufacture from these refractory alloys is made possible.

The discharge plane of the pro eller 9 is spaced away from the inletedges 0 the guide vanes 13-13 by a distance X greater than the minimumradialdimension Y of the discharge fluid passage for a reason to behereinafter more fully pointed out.

ed to be mounted opposite the flanged opena Having thus described thearrangement of a structure constructed in accordance with my invention,the operation thereof is as follows: When supplied with water and mud,the pro eller 9 nctions in' the usual manner, the teet -1111 functioningsomewhat as guide vanes to cause proper entry of the fluid to thepropeller and/t e guides 13-13, together with the cone 15, facil1tatinga smooth, unbroken discharge.

When rocks' and boulders of unreasonable size enter the device they arehit by the propeller blades andt 'rown back against the teeth 11-11.with .such force that they are either crushed and broken to such anextent that they may pass on through the propeller, or they are,continually thrown around between the blunt inlet propeller edges andthe teeth 1111 and rapidly reduced by attrition.

5 By making the dimension X greater than the dimension Y, as indicated,I insure that any fragment which is capable of passing through thepropeller 9 shall not become jammed between the propeller and the inlet1 edges of the vanes 13-18.

Upon the breakage or undue wear of any of the members, the dischargemember may be separated from the inlet member at the flanged jointshown, when the propeller 9 may 15 be removed fromthe end of the shaft 6and the member 10 may be slipped out and replaced. Similarly, the member14 may be renewed if desired.

While, in general, the clamping of the parts together at theflanged'joint prevents the rotation of the lining members 10 and 14, itwill be obvious that they may be keyed in place if so desired in orderto positively prevent rotation thereof.

While I have shown my invention in but one form, it will be obvious tothose skilled in the art that it is not so limited, but is susceptibleof various other changes and modifications, without departing from thespirit thereof, and I desire, therefore, that only such attempting topass through the pump.

2. The combination with a propeller pump enclosed in a casing andprovided with an 1ntake member, of a ring provided ,with inwardlyextending teeth mounted within said intake member, said teeth beingadapted to coact with the blades of the propeller to reduce foreignsubstances attempting to pass through the pump.

3. The combination with a propeller pump enclosed in a casing andprovided with an intake member, of a ring formed in a plurality ofdistinct segments and provided with in wardly extending teeth mountedwithin said intake member, said teeth being adapted to oo- 55 act withthe blades of the propeller to reduce foreign substances attemptmgtopass through the pump.

4:. The combination with a propeller pump, of a discharge membertherefor provided with guide vanes for preventing eddying, the dischargeplane of the propeller being spaced away from the inlet plane of saidvanes a distance at least as great as the mini mum radial dimension ofthe discharge fluid passage.

5. In a propeller pump structure, the combination with an inlet member,of a propeller mounted near the discharge opening thereof, a dischargemember coacting with said inlet member to provide a pump casing,internal 'teeth in said inlet member positioned so as to coact with thepro peller blades to reduce foreign bodies attempting to pass throughthe pump, and guide vanes within said'outlet member adapted to preventeddying in the discharge stream, the inlet plane of said guide vanesbeing spaced away from the discharge plane of said propeller a distanceat least as great as the minimum radial dimension of the discharge fluidpassage.

6. In a propeller pump structure, the combination with an inlet member,of a propeller mounted near the discharge opening thereof, a dischargemember coacting'with said inlet member to provide a pump casing,internal teeth'in said inlet member positioned so as to coact with thepropeller blades to reduce. foreign bodies attempting to pass throughthe pump, and guide vanes within said outlet member adapted to preventeddying in the discharge stream, the inlet plane of said guide vanesbeing spaced away from the dischargeplane of said propeller a distanceat least as great as the minimum radial dimension of the discharge fluidpassage, and said internal teeth and said guide vanes being carried byremovable lining members, whereby they may be readily renewed upon wearor breakage.

7. In a propeller pump structure, the combination with an inlet member,of a propeller mounted near the discharge opening thereof, a dischargemember coacting with said inlet member to provide a pump casing,internal teeth in said inlet member positioned so as to coact with thepropeller blades to reduce foreign bodies attempting to pass through thepum and guide vanes within said out let mem er adapted to preventeddying in the discharge stream, the inlet plane of said guide vanesbeing spaced away from the discharge plane of said propeller a distanceat least as great as the minimum radial dimen-- sion of the dischargefluid passage, and said internal teeth and said guide vanes beingcarried by removable lining members formed in separable segments,whereby they may be readily renewed upon wear or breakage.

' 8. In a'propeller pump structure, the combination with a curved hollowinlet member terminating in a plane opening, of a hollow boss projectingthereinto and surroundin a drive shaft carrying a propeller arranger Tto rotate in a plane paralle and adjacent to said discharge plane, alining member within said inlet member and carrying a plurality ofinwardly projecting teeth adapted to coact with the propeller blades inthe reduction of foreign bodies attempting to traverse the pump, and adivergent discharge member adapted to coact with said inlet member toprovide a pump casing, said discharge member being provided with aplurality of internal guide vanes carried by a removable lining member.

9. In a propeller pum structure, the combination with a curved ollowinlet. member terminating in a plane opening, of a hollow bossprojecting thereinto and surrounding a drive shaft carrying a propellerarranged to rotate in a plane parallel and adjacent to said dischargeplane, alining member within said inlet member and carrying a pluralityof inwardly projecting teeth adapted to coact with the propeller ladesin the reduction of foreign bodies attempting to traverse the pump, adivergent discharge member adapted to coact with said inlet member toprovide a pump casing, said discharge member being provided with aplurality of internal guide vanes carried by a removable lining member,the intake lane of said guide vanes being spaced away ii'om thediggiarge plane of said propeller a distance at east as great as theminimum radial dimension of the discharge fluid passage.

10. The combination with a rotary pump, of means within the casing andadjacent the inlet of the pump for reducing foreign substances byattrition.

11. The combination with a rotary pump, of abrasive means within thecasing and adjacent the inlet of the pump for reducing foreignsubstances .by attrition.

12. The combination with a rotary pump, of means providing an abrasivesurface extending around the interior of the casing and adjacent theinlet of the pump for reducing foreign substances by attrition.

In testimony whereof, I have hereunto subscribed my name this 28th dayof November, 1922.

HENRY F. SCHMIDT.

